chris

Common Problems 121983

DNS Resolver Timeouts on FreeBSD 15

🟡 Medium   ⏱ 5–30 min  Last verified: 29 July 2026 Affected versions: FreeBSD 15 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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How to Configure Grafana Alerting on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Configure Grafana Alerting on FreeBSD 15

Introduction Deploying configure grafana alerting on a FreeBSD 15 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + ports approach […]

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Debian 12 — phpunit — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — phpunit — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 29 July 2026 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-9841 CVE-2026-24765 CVE-2026-41570 Upstream summary: Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with […]

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openSUSE Tumbleweed — perl-Text-CSV_XS — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — perl-Text-CSV_XS — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2026:1936-1 (see also SUSE bugzilla) Related CVEs: CVE-2026-7111 Upstream summary: Text::CSV_XS versions before 1.62 for Perl have a use-after-free when registered callbacks extend the Perl argument stack, which may enable type confusion […]

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How to Configure Telegraf Metrics Agent on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Configure Telegraf Metrics Agent on FreeBSD 15

Introduction Deploying configure telegraf metrics agent on a FreeBSD 15 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + ports […]

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Debian 13 — duo-unix — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — duo-unix — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 July 2026 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-12135 Upstream summary: bson before 0.8 incorrectly uses int rather than size_t for many variables, parameters, and return values. In particular, the bson_ensure_space() parameter bytesNeeded could have an integer […]

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How to Install and Configure Fail2ban on FreeBSD 15 — step-by-step FreeBSD 15 tutorial on Progressive Robot

How to Install and Configure Fail2ban on FreeBSD 15

Introduction How to Install and Configure Fail2ban on FreeBSD 15 is a core administration task for any FreeBSD 15 server operator. FreeBSD 15 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]

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Ubuntu 22.04 — strongswan — multiple vulnerabilities (12 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — strongswan — multiple vulnerabilities (12 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 29 July 2026 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8196-1 Related CVEs: CVE-2026-35329 CVE-2026-35331 CVE-2026-35330 CVE-2026-35332 CVE-2026-35328 CVE-2026-35333 CVE-2026-35334 CVE-2026-25075  +4 more Upstream summary: Haruto Kimura discovered that strongSwan incorrectly handled the supported_versions extension in TLS. A remote attacker […]

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Ubuntu 20.04 — openjdk-21 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — openjdk-21 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 29 July 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8002-1 Related CVEs: CVE-2026-21945 CVE-2026-21933 CVE-2026-21932 CVE-2026-21925 CVE-2025-53057 CVE-2025-53066 CVE-2025-61748 CVE-2025-30754  +12 more Upstream summary: It was discovered that the RMI component of OpenJDK 21 would establish RMI TCP endpoint […]

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